## Config file
```yaml
common:
availableLanguages: [en, fr]
```
## With koa
```js
import App from 'koa';
import config from 'alp-node-config';
import language from 'alp-node-language';
const app = new App();
config('/config')(app);
language(app);
```
## context
### language: string
First accepted language in the header contained in `availableLanguages`, or the first language in `availableLanguages`.
### firstAcceptedLanguage: string
The first accepted language in the header regardless of `availableLanguages`. Can be a locale. Usefull for date/time/...
